1. What is the difference between "tell" and "say"?
2. What is the difference between TELL and SAY, and SPEAK 
3. What is the difference between "may" and "might"?
4. What is the difference between "under" and "below"?
5. What is the difference between yet and still?
6. What is the difference between edition and version?
7. What is the difference between interested and interesting?
8. What is the difference between "anything" and "any thing”?
9. What is the difference between people and peoples?
10. What is the difference between someone and somebody
11. What is the difference between WHO'S and WHOSE?
12. What is the difference between idioms and figures of speech 
13. What is the difference between idioms and proverbs?
14. What is the difference between "girl" and "daughter"?
15. What is the difference between count and noncount nouns
16. What is the difference between have got and have gotten

ที่มา จาก Merriam-Webster Learner’s Dictionary